package com.didi;

import java.util.HashSet;

/**
 * @ClassName MyStr
 * @Description
 * @Author xinggh
 * @Date 2020/8/24 17:16
 * @Version 1.0
 **/
public class MyStr {


    public static void main(String[] args) {
        HashSet hashSet = new HashSet();
        hashSet.add(null);
    }

   /* public int method(String string) {

    }*/
}
